• Author : Johan Ervenius


Resilient load-sharing using Nexthop Groups

Introduction Load-sharing of traffic flows towards a specific prefix in a L3 topology is usually achieved with Equal-Cost Multi-Path (ECMP) routing. With ECMP, multiple nexthops of equal preference are available for the prefix. Traffic is distributed towards the different next-hops based on a hashing algorithm and packets belonging to the same traffic flow are by default hashed to the same nexthop. A problem with ECMP is that if one of the nexthops is removed all flows are affected as a new hash should be calculated for all flows based on the remaining active nexthops. This can be remediated by using...
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MLAG: Traffic flow for single-homed hosts

Objective The objective of this document is to explain the traffic flows, best practice designs, and configuration details when single-homed devices are connected to an MLAG domain.  It is assumed that the reader is familiar with the concept of Leaf-Spine fabrics, MLAG, and VXLAN. More details about these concepts can be found on EOS Central. Recommended articles are: MLAG – Basic configurationMLAG – Advanced configurationVXLAN bridging with MLAGVXLAN routing with MLAG Introduction Arista’s Multi-Chassis LAG (MLAG) technology provides the ability to build a loop-free active-active layer 2 topology. The technology operates by allowing two physical Arista switches to appear as...
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